In an era when documentaries about famous people can be as light and sweet as the snacks you eat while watching them, Alex Gibney is going against the grain. His new documentary, “Musk,” which premiered at Venice Film Festival on Sept. 8, proves there’s still room for hard-hitting investigative docs in Hollywood — as long as you’re willing to sit through its nearly four-hour runtime.
From tackling Scientology in “Going Clear” to Theranos’ Elizabeth Holmes in “The Inventor,” Gibney has never backed away from a thorny topic. With “Musk,” the Oscar-winning filmmaker pulls no punches, painting a thorough portrait of the man who turned companies…
